|Publication number||US7882696 B2|
|Application number||US 11/770,262|
|Publication date||Feb 8, 2011|
|Filing date||Jun 28, 2007|
|Priority date||Jun 28, 2007|
|Also published as||US20090000304|
|Publication number||11770262, 770262, US 7882696 B2, US 7882696B2, US-B2-7882696, US7882696 B2, US7882696B2|
|Inventors||Morris G. Anderson, David K. Jan, George E. Zurmehly, Steve H. Halfmann, Christopher E. Zollars|
|Original Assignee||Honeywell International Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (54), Referenced by (7), Classifications (11), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention was made with Government support under contract number DAAH10-03-2-0007 awarded by the U.S. Army. The Government has certain rights in this invention.
The present invention generally relates to turbine engines, and more particularly relates to a bearing support and air mixer assembly for a turbine engine.
Various types of vehicles, such as jet airplanes and helicopters, utilize turbine engines as a primary power source for locomotion. Turbine engines may include a compressor section, in which inlet air is compressed, followed by a combustor section in which fuel is combusted with the compressed air to generate exhaust gas. The exhaust gas is then directed to a turbine section, where energy is extracted from the exhaust gas.
The compressor section and the turbine typically include multiple disks connected to a common bearing and/or shaft. Some turbine engines are configured such that a bearing support and/or aft frame must be provided to support the aft end of the bearing, while allowing for a substantially annular flow path for the exhaust.
The turbine exhaust may be mixed with air from a bypass stream of relatively cool, ambient air to improve power and reduce the amount of noise generated. This process is often facilitated with an air mixer that surrounds the bearing support. In order to provide structural support for the bearing, an aft frame with struts between the bearing support and engine outer case is typically used. These struts pass through the flow path for the exhaust, and although relatively small, the struts do significantly reduce engine power. Additionally, the limited size of the struts can adversely restrict the size of service lines (e.g., for oil, buffer air, etc.) to the turbo machinery within the bearing support.
Accordingly, it is desirable to provide a support and mixer assembly that reduces the need for the struts, while improving engine performance. Additionally, is it desirable to provide a support and mixer assembly that improves the service access to the turbo machinery in the bearing support. Furthermore, other desirable features and characteristics of the present invention will become apparent from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings and the foregoing technical field and background.
An integrated support and air mixer for turbo machinery is provided. The support and air mixer includes an inner annular member, an outer annular member shaped and positioned such that an annular air gap is formed between the inner annular member and the outer annular member, and a plurality of air mixing members, each air mixing member having a mixing passageway therethrough and each air mixing member having an inner portion connected to the inner annular member, an outer portion connected to the outer annular member, and first and second opposing side portions interconnecting the inner and outer portions and the inner and outer annular members such that the mixing passageway is in fluid communication with the annular air gap.
An integrated bearing support and air mixer for turbo machinery is provided. The support and air mixer includes a substantially circular inner annular member having a central axis, a substantially circular outer annular member concentric about the central axis and shaped and positioned such that an annular air gap is formed between the inner annular member and the outer annular member, a plurality of support members positioned around the inner annular member such that each pair of adjacent support members have an air separation gap therebetween in fluid communication with the annular air gap, the support members interconnecting the inner annular member and the outer annular member, and a plurality of air mixing pipes, each air mixing pipe having an air mixing passageway therethrough and each having an inner portion connected to the inner annular member, an outer portion connected to the outer annular member, and first and second opposing side portions connected to respective adjacent support members such that the air mixing passageway is in fluid communication with the annular air gap through the respective air separation gap between the respective adjacent support members.
According to another embodiment, a turbo engine is provided. The turbine engine includes a casing, a bearing extending through the casing, a plurality of disks connected to the bearing, and an integrated bearing support and air mixer supporting an end of the bearing. The integrated bearing support and air mixer includes a substantially circular inner annular member having a central axis, a substantially circular outer annular member concentric about the central axis and shaped and positioned such that an annular air gap is formed between the inner annular member and the outer annular member, a plurality of support members positioned around the inner annular member such that each pair of adjacent support members have an air separation gap therebetween in fluid communication with the annular air gap, the support members interconnecting the inner annular member and the outer annular member, and a plurality of air mixing pipes, each air mixing pipe having an air mixing passageway therethrough and each having an inner portion connected to the inner annular member, an outer portion connected to the outer annular member, and first and second opposing side portions connected to respective adjacent support members such that the air mixing passageway is in fluid communication with the annular air gap through the respective air separation gap between the respective adjacent support members.
The present invention will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements, and
The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, and brief summary or the following detailed description. It should also be noted that
The support/mixer assembly 16 is connected to the casing 12 at an aft end thereof and includes a bearing support (and/or aft frame) 26 and an exhaust mixer 28 that are combined into an integrated bearing support and air mixer 30 (or simply “support/mixer 30”), as shown in greater detail in
Referring now to
The outer annular member 34 is substantially circular with a hub opening 46 therethrough, is concentric with the inner annular member 32 about the central axis 40, and has a forward (or first) end 48 and an aft (or second) end 50. The outer annular member 34 includes a series of lobes 52 and troughs 54 formed thereon near the second end 50 thereof. Each lobe 52 has an outer portion 56, first and second opposing side portions 58, and a lobe passageway 60 extending therethrough, which is formed between the respective lobe 52 and the inner annular member 32. The lobes 52 are separated by the troughs 54 such that a distance lies between outer surfaces of respective first and second side portions 58 of each pair of adjacent lobes 52, and although not specifically illustrated, the lobes 52 each have a width as measured between the side portions 58 thereof at the second end 50 of the outer annular member 34. An annular air gap 62 is formed between the inner annular member 32 and the outer annular member 34 and between the first ends 42 and 48 of the annular members 32 and 34 and the lobes 52. The annular air gap 62 is connected to, or in fluid communication with, the lobe passageways 60.
The air mixing members 36 are connected to the inner and outer annular members 32 and 34 and aligned with the lobes 52 such that the air mixing passageways 70 are in fluid communication with the annular air gap 62 through the lobe passageways 60. Each air mixing member 36 includes an inner portion 64, an outer portion 66, and first and second opposing side portions 68 and has an air mixing passageway 70 therethrough. The inner portions 64 of the air mixing members 36 are connected to the inner annular member 32, the outer portions 66 of the air mixing members 36 are connected to the outer portions 56 of the lobes 52 on the outer annular member 34, and the side portions 68 of the air mixing members 36 are connected to the side portions 58 of the lobes 52. The air mixing members 36 are shaped such that the air mixing passageways 70 extend in a direction that is substantially parallel with the central axis 40. That is, as is evident in
The air mixing members 36 have a width, as measured between the side portions 68, that is approximately the same as the widths of the lobes 52, and a height, as measured between the inner and outer 64 and 66 portions thereof. In one embodiment, the height of the air mixing members 36 is greater than the width of the air mixing members 36. The width of the air mixing members 36, in combination with the spacing of the lobes 52, causes air mixing gaps 72 to be formed between the respective first and second side portions 68 of each pair of adjacent air mixing members 36. The height of the air mixing members 36, in combination with the diameter of the inner annular member 32, causes a bearing air gap (or sump area) 74 to be formed about the central axis 40 between the air mixing members 36 on opposing sides of the central axis 40.
The support/mixer 30 also includes support members 76 that interconnect the inner annular member 32, the outer annular member 34, and the air mixing members 36. The support members 76 may form part of the troughs 54 of the outer annular member 34, and as such, may at least partially interconnect the respective side portions 58 of the lobes 52. As shown most clearly in
During operation, referring to
Exhaust from the turbine is sent into the annular air gap 62 of the support/mixer 30. The exhaust flows from the annular air gap 62 into the lobe passageways 60 and the air separation gaps 78. The exhaust that enters the air separation gaps 78 is split into the two adjacent air mixing members 36 by the support members 76, while the remainder of the exhaust flows directly into the air mixing passageways 70. The curvature in the sides of the air mixing members 36 and/or the lobes 52 facilitates the removal of the rotational component (swirl) of the air left over from the turbine. At the same time, while the vehicle is in motion, ambient air outside of the casing 12 is forced through the outer flow path 24 (
One advantage of the support/mixer assembly described above is that because the bearing support and air mixer are integrated into a single, integral component, the number of parts required to construct the turbine engine is reduced. Another advantage is that the mixing of the exhaust with the ambient air is improved, along with gas pressure recovery performance, resulting in increased power, improved efficiency, and reduced noise, as well as allowing an overall reduction in the length of the assembly. Additionally, because no struts are needed to be placed within the path of the exhaust, performance is even further improved. Another advantage is that because of the gaps between the air mixing members, service lines may be fed into the turbo machinery without disrupting the flow of the exhaust. The air gaps between the air mixing members also increase the flow of ambient air to the bearing air gap, thus improving the cooling of the bearing assembly.
Other embodiments may utilize configurations of turbo machinery other than the turboshaft turbine engine shown in
While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing the exemplary embodiment or exemplary embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope of the invention as set forth in the appended claims and the legal equivalents thereof.
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|U.S. Classification||60/262, 60/39.5, 60/770, 181/220|
|Cooperative Classification||F02K1/46, F02K1/386, F01D25/28|
|European Classification||F02K1/46, F01D25/28, F02K1/38C|
|Jun 28, 2007||AS||Assignment|
Owner name: HONEYWELL INTERNATIONAL, INC., NEW JERSEY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ANDERSON, MORRIS G.;JAN, DAVID K.;ZURMEHLY, GEORGE E.;AND OTHERS;REEL/FRAME:019496/0665
Effective date: 20070627
|Jul 25, 2014||FPAY||Fee payment|
Year of fee payment: 4